Thanks to federalevidencereview.com here is an interesting case about preserving the issue for appeal. In this case there was a pretrial motion and the judge denied the defense its requested relief.
The government claimed the plain error standard would apply, as at trial the defendant failed to preserve the issue for appeal.
The Tenth Circuit disagreed that plain error applied to the issue. The circuit noted that while the matter did not develop at trial, it had been the subject of a motion in limine by the defendant. The trial court rejected the motion in limine. The circuit noted a standard that applied in the circuit to whether a party’s actions were sufficient to preserve the issue for appeal. In doing so, the court noted FRE 103(a), which relieves a party from having to renew an object at trial if the court had previously made "a definitive ruling on the objection." FRE 103(a).